Map pling Sickle-cell anemia is a disease that affects the type of hemoglobin (Hb) a person makes in his or her red blood cells. Consider the case of Martin and Cindy, who are the parents of Mary. Martin has sickle-cell anemia with abnormal hemoglobin, and his genotype is HbS/HbS. Cindy has normal hemoglobin, and her genotype is HbA/HbA Their child, Mary, carries the sickle-cell trait and produces both normal hemoglobin and abnormal hemoglobin. Mary's genotype is Hbs/HbA. What type of dominance pattern would result in Mary's blood producing both normal and abnormal O incomplete dominance O pseudodominance O complete dominance O codominance

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy

Number and variety of living organisms includes genetic, species, and ecological types